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yaml --- r: 123044 b: refs/heads/master c: 0186f47 h: refs/heads/master v: v3
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Kumar Gala
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Paul Mackerras
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Dec 3, 2008
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| Original file line number | Diff line number | Diff line change |
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| @@ -1,2 +1,2 @@ | ||
| --- | ||
| refs/heads/master: df3b8611554e389e703fa753540289874fa5126c | ||
| refs/heads/master: 0186f47e703fb7aa14b54459d642ef5374b3a685 |
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * This file contains common routines for dealing with free of page tables | ||
| * | ||
| * Derived from arch/powerpc/mm/tlb_64.c: | ||
| * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | ||
| * | ||
| * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) | ||
| * and Cort Dougan (PReP) (cort@cs.nmt.edu) | ||
| * Copyright (C) 1996 Paul Mackerras | ||
| * | ||
| * Derived from "arch/i386/mm/init.c" | ||
| * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | ||
| * | ||
| * Dave Engebretsen <engebret@us.ibm.com> | ||
| * Rework for PPC64 port. | ||
| * | ||
| * This program is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU General Public License | ||
| * as published by the Free Software Foundation; either version | ||
| * 2 of the License, or (at your option) any later version. | ||
| */ | ||
|
|
||
| #include <linux/kernel.h> | ||
| #include <linux/mm.h> | ||
| #include <linux/init.h> | ||
| #include <linux/percpu.h> | ||
| #include <linux/hardirq.h> | ||
| #include <asm/pgalloc.h> | ||
| #include <asm/tlbflush.h> | ||
| #include <asm/tlb.h> | ||
|
|
||
| static DEFINE_PER_CPU(struct pte_freelist_batch *, pte_freelist_cur); | ||
| static unsigned long pte_freelist_forced_free; | ||
|
|
||
| struct pte_freelist_batch | ||
| { | ||
| struct rcu_head rcu; | ||
| unsigned int index; | ||
| pgtable_free_t tables[0]; | ||
| }; | ||
|
|
||
| #define PTE_FREELIST_SIZE \ | ||
| ((PAGE_SIZE - sizeof(struct pte_freelist_batch)) \ | ||
| / sizeof(pgtable_free_t)) | ||
|
|
||
| static void pte_free_smp_sync(void *arg) | ||
| { | ||
| /* Do nothing, just ensure we sync with all CPUs */ | ||
| } | ||
|
|
||
| /* This is only called when we are critically out of memory | ||
| * (and fail to get a page in pte_free_tlb). | ||
| */ | ||
| static void pgtable_free_now(pgtable_free_t pgf) | ||
| { | ||
| pte_freelist_forced_free++; | ||
|
|
||
| smp_call_function(pte_free_smp_sync, NULL, 1); | ||
|
|
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| pgtable_free(pgf); | ||
| } | ||
|
|
||
| static void pte_free_rcu_callback(struct rcu_head *head) | ||
| { | ||
| struct pte_freelist_batch *batch = | ||
| container_of(head, struct pte_freelist_batch, rcu); | ||
| unsigned int i; | ||
|
|
||
| for (i = 0; i < batch->index; i++) | ||
| pgtable_free(batch->tables[i]); | ||
|
|
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| free_page((unsigned long)batch); | ||
| } | ||
|
|
||
| static void pte_free_submit(struct pte_freelist_batch *batch) | ||
| { | ||
| INIT_RCU_HEAD(&batch->rcu); | ||
| call_rcu(&batch->rcu, pte_free_rcu_callback); | ||
| } | ||
|
|
||
| void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf) | ||
| { | ||
| /* This is safe since tlb_gather_mmu has disabled preemption */ | ||
| cpumask_t local_cpumask = cpumask_of_cpu(smp_processor_id()); | ||
| struct pte_freelist_batch **batchp = &__get_cpu_var(pte_freelist_cur); | ||
|
|
||
| if (atomic_read(&tlb->mm->mm_users) < 2 || | ||
| cpus_equal(tlb->mm->cpu_vm_mask, local_cpumask)) { | ||
| pgtable_free(pgf); | ||
| return; | ||
| } | ||
|
|
||
| if (*batchp == NULL) { | ||
| *batchp = (struct pte_freelist_batch *)__get_free_page(GFP_ATOMIC); | ||
| if (*batchp == NULL) { | ||
| pgtable_free_now(pgf); | ||
| return; | ||
| } | ||
| (*batchp)->index = 0; | ||
| } | ||
| (*batchp)->tables[(*batchp)->index++] = pgf; | ||
| if ((*batchp)->index == PTE_FREELIST_SIZE) { | ||
| pte_free_submit(*batchp); | ||
| *batchp = NULL; | ||
| } | ||
| } | ||
|
|
||
| void pte_free_finish(void) | ||
| { | ||
| /* This is safe since tlb_gather_mmu has disabled preemption */ | ||
| struct pte_freelist_batch **batchp = &__get_cpu_var(pte_freelist_cur); | ||
|
|
||
| if (*batchp == NULL) | ||
| return; | ||
| pte_free_submit(*batchp); | ||
| *batchp = NULL; | ||
| } |
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